Is it possible to speed up page loading by placing JavaScript before the closing </body> tag? Consider this scenario:
<body>
Sample content
<script type="text/javascript" src="jQuery.js"></script>
<script type="text/javascript">
$(function(){
});
</script>
</body>
Although the page's loading time will remain the same, users may perceive it as loading faster with elements appearing more quickly on the screen.
In my opinion, I recommend keeping the jQuery.js reference in the <head> section and placing your custom code towards the end of the <body>.
It's hard to say if it loads faster (I doubt it), but in this scenario, you don't have to enclose your code within $(document).ready because the document will already be prepared for manipulation:
<body>
balbllb content
<script type="text/javascript" src="jQuery.js"></script>
<script type="text/javascript">
// directly manipulate the DOM here
</script>
</body>
Speed isn't the only factor, it's also about the sequence of events. By placing scripts at the bottom (just before the closing body tag), you ensure that the main content loads first before loading the scripts, giving the illusion of quicker loading times.
Although the total page load time remains the same, the user will perceive the page as loading faster due to appearing quicker. This theory of "loading faster perception" has been supported by psychologists through various studies.
It is important to note that when placing JS libraries at the bottom of the page (which is recommended), any dependent scripts should also be positioned after the libraries at the bottom.
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